#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv){
	pid_t pid = fork ();
	if (-1 == pid ){
		perror ("fork()");
		return -1;
	}
	if (0 == pid ){
		//子进程
		while(1){
			//write (1,"!", 1);
			sleep(1);
			printf("child:pid = %d, ppid = %d\n", getpid(), getppid());
		}
	}else{
		while(1){
			//write (1, "#", 1);
			sleep(1);
			printf("parent:pid = %d, ppid = %d\n", getpid(), getppid());
		}
	}
	return 0;
}
